Rotary engine.



No. 719,163. PATENTED JAN. 27, 1903. A E. ULLAND.- I

ROTARY ENGINE.

APPLICATION FILED NOV. 11, 1901.

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PATENTBD JAN. 27, 1903.

E. ULLAND. ROTARY ENGINE.

APPLIoATloN FILED Nov. 11, v1901.

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E. ULLAND. ROTARY ENGINE.

APPLIOATION FILED NOV. 11, 1901.

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EVEN ULLAND, OF MINNEAPOLS, MNNFSOTA.

ROTARY ENGINE.

PECTLFICATION forming part of Letters Patent No. 719,163, dated January 2'7, 1903. Application filed November 11, 1901. Serial No. 81,822. (No model.)

T0 1r/ZZ 1072/0771, it 717.501)/ concern:

Be it known that l, EVEN ULLAND, a citizen ot the United States. residingfat Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Rotary Engines; and I do hereby declare the following to be a full, clear, and exactdescription of the in veut-ion, such will enable others skilled in the art to which it appertains to make and use the saine.

My invention relates to rotary engines, and has `for its object to improve the saine in the several particulars hereinafter noted.

The invention consists of the novel devices and combinations of devices hereinafter' de scribed, and defined in the claims.

The invention is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Figure l is a right side elevation showing an engine embodying my invention. Fig. 2 is a plan view of the engine with some parts broken away. Fig. 3 is a vertical section on the line w3 913 of Figs. 2 and 4. Fig. 4 is a horizontal section on the line x4 @c4 of 3. Fig. 5 is a View, partly in elevation and partly in section, on the line m5 x5 of Fig. 2. Fig. 6 is a detail view in plan and with some parts broken away showing the pair of rotary pistons removed from working position; and Fig. 7 is a view corresponding to Fig. 5, but with all parts shown in full and illustrating a slightlymodiied construction of the shaftbearings.

The cylinder-casting is made up of three sections a a2 c3 and is formed with a pair of annular piston-seats a4. The sections a c2 a3 are bolted or otherwise rigidly but detachably secured together, and at their inner portions they are spaced apart at co5 to form narrow annular passages for the piston disks or wheels, as will be hereinafter made clear. The outer piston members d2 d3 are connected by radial arms with bearing-hubs a6. The intermediate piston member Ct' is provided at diametrically opposite points with radially-projecting abutment-seats cti, which open one into each of the annular piston-seats d'1. Admission-ports as open from the intermediate portions of the abutment-seats co7 into the corresponding piston-seats a4 ahead of the said piston-seats with respect to the direction of travel of the pistons. Steam-supply ports a, formed in narrow neck portions 0.10, open into the abutment-seats ai, and steam-supply pipes a open into the said supply-passages ai. Suitable cut-oit valves b work in suitable seats @12in the said neck portions 0,10. These cut-off valves b are operated as hereinafter described.

alg indicates exhaust-ports which open at diainetrically opposite points, one from each of the annular piston-seats c4.

c indicates theengine-shaft, which is suitably mounted in the bearing-hubs c, previously noted, and is shown as provided at one end with a pulley c', from which power may be transmitted through a belt. (Not shown.) Rigidly secured to the shaft c between the bearing-hubs a6 is a pair of so-called pistonwheels f, the peripheral portions of which are annular and work closely within the annular seats a5. Suitable annular packingsf form steam-tight joints between these annular portions ot' the wheels f and the annular sides of said seats a5. Each wheelf has rigidly secured toits peripheral portion a transversely-extended piston head or block f2, which closely {it-s within the corresponding annular piston-seat co4. Suitable packings (not shown) may be carried by the'pistonheads f2 to form steanrtight joints between the same and their seats.

A radially movable` abutment g works freely within each abutment-seat al. These abutments are yieldingly forced inward by springs g, and they are cut away at their central portions at g2 to adord passages which always leave the steam-ports as and ai in communication.

On each end of the shaft c, just outward of the cylinder-castings, is a cam g3, which has a profile cam-groove g4, the outline of which is best indicated in Fig. l. Also on each end of said shaft cis an eccentric b. The eccentrics b are set eccentrically on the same radial lines, and they are connected by pitmen or eccentric-straps b2, one to each of the cutoft valves b. As the said cut-off valves are located at diametrically opposite points, it is evident that the eccentrics b will cause said valves to open and close in reverse order- IOO that is, the one is one hundred and eighty degrees in advance of the other with respect lo the rotation of the piston-wheels.

Each abutment g has a laterally-projecting lug g5, to which is secured the outer end of a stem gG, mounted to move in guide-lugs Q7 on the adjacent section of the cylinder and provided at its inner end with a roller or stud g8, which works in the cam-groove g4 of the corresponding cam g3. The offset portions of the cam-grooves g5 extend on the same radial lines, so that the abutments g will be moved the one one hundred and eighty degrees in advance of the other with respect to the movement of the piston-wheels. Under the actions of the said cam-grooves and con nections described the abutments as the respective piston-heads f2 closely approach them are moved outward entirely out of the annular piston-seats CL4, thereby permitting the said piston-heads to freely pass, and are then quickly moved again inward to their normal positions, (indicated in Figs. 3 and 4,) so that they then serve as abutments. When the parts stand in the position indicated in Figs. l, 2, and 3, for example, live steam is admitted from the supply-pipe d through the ports a, g2, and d8 into the forward piston-seat a4 between the abutment g and cooperating piston-head f2. When the rotary pistons have traveled about ninety degrees, the coperating admission-valve b will be movedso as to cut off live steam and cause the said rotary piston to be driven under expanding steam u ntil it passes the cooperative exhaust-port als.

From what has above been stated it will of course be understood that while the one piston-head is traveling from the exhaust-point on to the point where it again is subjected to the action of the live steam the other pistonhead is being driven either under the action of live steam or caged steam under expansion. Otherwise stated, there is no dead-point in the action ot' the engine-that is, no point at which the engineY may be stopped and not started by the admission of steam. The action of the engine is also rendered continuous and steady.

It is very important to note that the wheel or disk which carries the so-called piston head'or block is very narrow as compared with the Width of the said head or block, thereby reducing to a minimum the lateral pressure or thrust which is thrown upon the engine-shaft.

It will of course be understood that the engine above specifically described is capable of many modifications as to details of construction Within the scope of my invention as herein claimed.

In Fig. 7 the shaft c is shown as mounted in the hubs of laterally-projecting bearingbrackets m, bolted or otherwise rigidly secured to the sides of the cylinder-casting.

m indicates an oil-cup, shown as mounted on one ot' the bearings m.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

l. In a rotary engine, the combination with the cylinder-casting made up of the sections ct 0,2 t3 having the abutment-seats 0,7, annular piston-seats a4 with annular slits a5, and admission-ports leading into said seats a4 through said seats a7, of the piston-wheels f Working in said slits d5 and provided with piston-heads f2 ttingsaid seats a?, means for operating said abutments in reverse order, which abutments operate as valves to control the admission of steam, substantially as described.

2. In a rotaryengine, the combination with the cylinder-casting made up of the sections a a2 a3 having the abutment-seats a7 With ports a8 and a9, and having the annular piston-seats a4 with annular slits a5 and annular packings f', of the abutments g g2 working in said abutment-seats, the piston-wheels f filling said slits a5 and provided with p'iston-headsj'72 litting said seats d4, the cut-oft valves b controlling the admission of steam to said ports a, and means for operating said two abutments and said two cut-off valves in reverse order, said abutments acting as valves, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

' EVEN ULLAND.

Vitnesses:

ELIZABETH KELIHER, F. D. MERCHANT. 

